A3989SEVTR-T

A3989 Bipolar Stepper and High Current DC Motor Driver Discontinued Product This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: July 1, 2019 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A5989GEVTR-T. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. A3989 Bipolar Stepper and High Current DC Motor Driver FEATURES AND BENEFITS ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ DESCRIPTION 36 V output rating 2.4 A DC motor driver 1.2 A bipolar stepper driver Synchronous rectification Internal undervoltage lockout (UVLO) Thermal shutdown circuitry Crossover-current protection Very thin profile QFN package The A3989 is designed operate at voltages up to 36 V while driving one bipolar stepper motor at currents up to 1.2A, and one DC motor at currents up to 2.4 A. The A3989 includes a fixed off-time pulsewidth modulation (PWM) regulator for current control. The stepper motor driver features dual 2-bit nonlinear DACs (digital-to-analog converters) that enable control in full, half, and quarter steps. The DC motor is controlled using standard PHASE and ENABLE signals. Fast or slow current decay is selected via the MODE pin. The PWM current regulator uses the Allegro™ patented mixed decay mode for reduced audible motor noise, increased step accuracy, and reduced power dissipation. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Package: 36 pin QFN with exposed thermal pad 0.90 mm nominal height (suffix EV) Protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO) and crossover current protection. Special power up sequencing is not required. The A3989 is supplied in a leadless 6 mm × 6 mm × 0.9 mm, 36-pin QFN package with exposed power tab for enhanced thermal performance. The package is lead (Pb) free, with 100% matte tin leadframe plating. Not to scale 0.1 µF 50 V CP1 0.1 µF 50 V CP2 100 µF 50 V VCP VDD VBB 0.22 µF 50 V VBB OUT1A OUT1B PHASE1 I01 Microcontroller or Controller Logic A3989 I11 SENSE1 OUT2A PHASE2 OUT2B I02 SENSE2 I12 PHASE3 OUT3A ENABLE OUT3A MODE OUT3B VREF1 OUT3B VREF2 SENSE3 VREF3 GND GND SENSE3 Figure 1. Typical application circuit A3989DS, Rev. 6 MCO-0000354 July 1, 2019 A3989 Bipolar Stepper and High Current DC Motor Driver SELECTION GUIDE Part Number Packing A3989SEV-T 61 pieces per tube A3989SEVTR-T 1500 pieces per reel ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Load Supply Voltage VBB Logic Supply Voltage VDD Output Current* IOUT Logic Input Voltage Range VIN Notes Pulsed tw < 1 µs VREFx Pin Voltage Operating Temperature Range Junction Temperature Storage Temperature Range VSENSEx Units V 38 V –0.4 to 7 V Stepper motor driver, continuous 1.2 A Stepper motor driver, pulsed tw < 1 µs 2.8 A Dc motor driver, continuous 2.4 A Dc motor driver, pulsed tw < 1 µs SENSEx Pin Voltage Rating –0.5 to 36 Pulsed tw < 1 µs 3.5 A –0.3 to 7 V 0.5 V 2.5 V 2.5 V –20 to 85 °C TJ(max) 150 °C Tstg –55 to 150 °C VREFx TA Range S * May be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a Junction Temperature of 150°C. THERMAL CHARACTERISTICS: May require derating at maximum conditions Package Thermal Resistance Symbol RθJA Test Conditions EV package, 4 layer PCB based on JEDEC standard Min. Units 27 °C/W Power Dissipation versus Ambient Temperature 5500 5000 4500 4000 Power Dissipation, PD (mW) Characteristic 3500 3000 2500 2000 1500 EV Package 4-layer PCB (RθJA = 27 ºC/W) 1000 500 0 25 50 75 100 125 Temperature (°C) 150 175 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 A3989 Bipolar Stepper and High Current DC Motor Driver Functional Block Diagram 0.1 µF 50 V 0.1 µF 50 V VDD DMOS Full Bridge 1 OSC CHARGE PUMP 0.22 µF 50 V To VBB2 VBB VBB VCP CP2 CP1 100 µF 50 V VBB1 VCP OUT1A PHASE1 OUT1B I01 I11 Control Logic Stepper Motor PHASE2 DMOS Full Bridge 2 I12 RS1 VBB1 - Sense1 3 PWM Latch BLANKING + VREF1 SENSE1 GATE DRIVE I02 OUT2A 3 + VREF2 PWM Latch BLANKING - Sense 2 OUT2B VCP PHASE3 Control Logic DC Motor ENABLE MODE Sense 2 GATE DRIVE RS2 OUT3A OUT3A DMOS Full Bridge 3 PWM Latch BLANKING + 3 OUT3B OUT3B SENSE3 RS3 GND GND NC NC NC SENSE3 NC VREF3 - Sense 3 SENSE2 Sense 3 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3 A3989 Bipolar Stepper and High Current DC Motor Driver ELECTRICAL CHARACTERISTICS [1]: Valid at TA = 25 °C, VBB = 36 V, unless otherwise noted Characteristics Symbol Test Conditions Min. Typ. [2] Max. Units Load Supply Voltage Range VBB Operating 8.0 – 36 V Logic Supply Voltage Range VDD Operating 3.0 – 5.5 V VDD Supply Current IDD – 7 10 mA – 350 450 mΩ – 350 450 mΩ Source driver, IOUT = –1.2 A, TJ = 25°C – 700 800 mΩ – 700 800 mΩ IOUT = 1.2 A – – 1.3 V –20 – 20 µA – – 8 mA V Output On Resistance (DC motor driver) Output On Resistance (stepper motor driver) Source driver, IOUT = –1.2 A, TJ = 25°C Sink driver, IOUT = 1.2 A, TJ = 25°C RDS(on)DC RDS(on)st Sink driver, IOUT = 1.2 A, TJ = 25°C Vf , Outputs Output Leakage IDSS Outputs, VOUT = 0 to VBB VBB Supply Current IBB IOUT = 0 mA, outputs on, PWM = 50 kHz, DC = 50% CONTROL LOGIC Logic Input Voltage Logic Input Current VIN(1) 0.7×VDD – – VIN(0) – – 0.3×VDD V –20